Questions tagged [power]

Power is the ability to supply a device with energy. This question covers how to power the Pi, ways to do it, and the safe ranges of power.

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Raspberry Pi does not reboot with powered external HDD attached

I have recently set up a Plex Media Server on a new Raspberry Pi 4 (4 Gb). This is powered using it's own official power supply, the Pi is connected via USB to a powered USB hub which has a 1TB WD ...
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62 views

RPi 3 - Reduce power consumption

I am looking to reduce the power consumption to a minimum on my RPi 3. For my project, the Raspberry Pi Zero is not an option. for now, I disabled Bluetooth and WiFi and made sure to kill some ...
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1answer
40 views

Raspberry Pi 3 b+ seemed to be dead because of excessive vlotage of around 5.5 volts. Can anybody help?

My rapsberry pi 3 b+ constantly showed the under-voltage warning, so I connected my PSU to th RPI and setted the output voltage to be around 5.5v. I measured a voltage of around 5.2v when the RPI was ...
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Powering a raspberry pi 4 using a micro usb power supply with adapters

I previously owned a raspberry pi model 3b+ and have purchased a new raspberry pi 4b (4 gigabyte ram). I have an official micro USB power supply and some micro USB to USB type C converters designed to ...
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129 views

Can the 3b+ power two usb SSD drives?

Can I power two usb drives using USB to satas or do i need a powered USB hub?
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Raspberry pi 3B+ won't boot, solid red light

My Pi won't boot, I was coding my Pi when my friend came and wanted to see a movie from the Pi, I shut it down normally and close the power supply, then changed the SD card that had kodi on and tried ...
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How can I mount a speaker on to a Pi so that it is light enough for it to be mobile

Can I mount a speaker on a mobile Pi robot together with a suitable power supply? Ideally I’d like the Pi to follow a fixed route while emitting a fixed repeating tone.
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No activity LED after shorting a GPIO to ground : dead or fixable?

This is a model 3B+, due to some under-power warnings on the screen I was testing the actual voltage between the 5V and ground pins on the header, but managed to touch pin 40 (SCLK) to pin 39 (GND) ...
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66 views

What happens to the GPIO voltage after shutdown?

I don't have a Raspberry Pi laying around at the moment and I would like to detect if my Raspberry Pi is shuted down. My Idea is that maybe after the Pi shutted down the Voltage at the 3V3 pin will ...
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I think I fried my Raspberry Pi, but I'm not sure

I was making connections from my Raspberry Pi to a relay module. While I was running some sample code, I noticed that after I had terminated the program I was still getting a high CPU usage (around 60%...
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Choosing a Pi4 power supply

I'm trying to decide what is the best option for powering a Pi4. The specs mention for a minimum of 3A. Let's consider we would also like to connect a 2.5" drive to the Pi4. Could someone more ...
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HDMI power circuit on the Raspberry Pi 4

The previous models of the Raspberry Pi used different circuits to connect its 5 V power rail to the HDMI connector, i.e. How much current can I draw from each model's HDMI socket? Especially the ...
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1answer
159 views

Powering the Pi 4 - safe voltage levels and current requirements

How to safely power the Pi 4, more specifically: What voltage levels are safe to power the Pi 4 via the USB-C connector or via the GPIO header? What are the current requirements? What Power ...
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1answer
37 views

Power on a machine by pressing a physical button

There is a machine which usually runs in standby mode, and the only way to wake it up is by pressing a physical button with a small force and then quickly release. I want to remotely push the button ...
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What is the highest voltage from the power supply a Raspberry Pi 3 B can handle without getting damaged?

I am using Android things on Raspberry Pi 3 B with a 7-inch touch screen. Currently, I always see a yellow thunder bolt sign on the screen which means that the Raspberry Pi isn't receiving a high ...
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2answers
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Pin powered Pi crashes when servos move

I have been working on a circuit to power a Raspberry Pi and servo(s) from a single power source. The diagram below shows the basic configuration, although the 'AA battery' is actually two 18650s. ...
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2answers
48 views

Detect when the rpi3b+ has shut down

I have a pi in an embedded project. When the user turns the instrument off, I want to inhibit turning back on until the pi is done shutting down. I can do this with a timer circuit, but would like to ...
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Pi Remains Running When External (Powered) HD is connected

I have a Pi3B+. Attached is a (powered) Western Digital My Book external hard drive. When I accidentally unplugged the power to the Pi, it kept running, happy as can be with the only other energy ...
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1answer
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Most recommended power-supply option from dual-port Powerbank

I have a Raspberry Pi 3 model B [1]. It's powered by a DC adapter that outputs 5.1V and 2.5A. Although I consider ocassional manual reboots, I'm planning to use a Powerbank as some kind of UPS, after ...
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1answer
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SD card vs USB stick: best secondary storage for sudden shutdowns projects

I have a Raspberry Pi with Raspbian Raspbian Stretch Lite on a read-only SD card which periodically saves files on the secondary storage. Since there will be sudden shutdowns I'm wondering which ...
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1answer
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Connecting Pi-Zero W to Adafruit Powerboost 1000 through Extension Header or USB

As the title states I want to power my pi-zero with an adafruit powerboost 1000. I have looked into ways to do this and it seems there are 2 possibilities: Use the USB output of the powerboost to ...
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When is the RPi safe to power down? [duplicate]

My RPi3B+ is an embedded front end for a scientific instrument. I have an interface PCB with a 3amp 5v regulator, driven by a 48v supply. I monitor the 48v with ADC polled each 100ms, then sudo ...
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Safely connect Adafruit's powerboost 1000C LBO to rPi-GPIO

I would like to connect Adafruit's powerboost 1000C LBO control pin to a rPi GPIO-pin. So I can gracefully shutdown my rPi when the LiPo runs low. I would like to connect the LBO to a diode to lower ...
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can low power be the cause of low WiFi speed?

I'm using a raspberry pi 2 model b running Ubuntu core, and a TP-Link TL-WN821Nv3 USB WiFi adapter, which has a maximum speed of 300mbps/37.5mBps, and a Samsung charger which supplies 2A (lower than ...
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2answers
780 views

Power LED from 3.3V Power Pin without Resistor

I tried wiring one white LED to the 3.3V pin on a Pi Zero W with a 330 Ohm resistor but it's not as bright as I would like. If I wire it up without a resister I get a good amount of brightness. Is ...
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1answer
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measuring phase difference in 3 phase power

For my ceramics oven I had 3 phase power installed. But power consumption according to the meter is way higher than the nominal 7KW the oven consumes. A friend told me that if the phase (or sinus) is ...
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47 views

Connecting 4 WiFi USB Adapters to Raspberry Pi 3

I'm trying to get 4 Wifi adapters running off the Pi (overkill I know), the adapter in question is the Alfa Network AWUS036NHA, the Pi runs smoothly and reads the adapters as I plug them in one by one ...
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1answer
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Raspberry Pi Shows Low Power Lightning Bolt When Only Using 1 of 3 Amps

My Raspberry Pi 3B+ is running Kali Linux on the official 7" display. I am using an Anker power bank that says: "5V=6A (3A max per port)" in the description. When using the Pi, it constantly shows the ...
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Raspberry Shut down After trying to connect fan

I just bought a new Raspberry Pi 3B+ UK and was working with it for about 2 hours, and then when I was not at home, my son noticed that the CPU is hot and tried to cool it down with a normal 5V PC fan ...
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Reflective IR sensor Is not as sensitive as its designed to be

I'm working on a project where I'm repurposing sensors from a Pop-a-shot machine Sensors we're using https://www.popashot.net/shop/accessories/scoring-sensors/ The sensors are a 4 pin reflective IR ...
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2answers
107 views

Shorted 3.3v + 5v together. Is it possible to repair?

I was reading through some instructions on how to add a power off/on button to the Pi and accidentally misread instructions and shorted the two end pins on a 3+B model, which appear to be 3.3v and 5v. ...
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1answer
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RPI3 WiFi connection is established only when connected to the access point with a LAN cable

I can successfully connect to my RPI using SSH when the RPI is connected to a wireless access point and powered by a Xiaomi battery; but I cannot when I pull off the power and plug in the socket & ...
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1answer
66 views

Do I need powered USB hub for WD External Drive?

I just got a WD MyPassport external drive, that is solely powered via USB (there are no other plugs). I have seen in various places that a powered USB port is suggested for the RPi, but I can't quite ...
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Control 12V motor from 3.3V GPIO with external 12V Power Supply

I have a 12V motor, which I need to control from my Raspberry Pi (through the RaspiRobot Board). However, the RaspiRobot Board gives me only 3.3V for the motor. At the same time, I have a 12V adapter ...
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2answers
112 views

Only red light, broken?

Last week I've bought a Raspberry pi3 b+ for my project. Today I've accidentally connected the 5v pin and the other 5v pin or with the 3v and then it has just shutdown. This time it wont boot, only ...
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26 views

Long term screw terminal power

Okay so I have a PCA9685 hooked up to a raspberry pi 3 so that it can control multiple servos via a c++ program. Currently, I have them hooked up to a battery pack that has red and black wires as gnd ...
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52 views

Connecting Raspberry Pi to old found TFT display

I have an old car DVD player sitting around that has a fairly decent secondary TFT LCD screen (hannstar 721h440b19-a1) that I thought I could use with my Raspberry Pi 3 Model B. I opened up the unit,...
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1answer
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LiPo Voltage Drops

I am experiencing voltage drops with the following setup and I hope someone with mad electronics skills can explain my mistake to me: Raspberry Pi 3 Model B TFP401 Display Driver 7.0 Inch TFT Display ...
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1answer
44 views

Power indication

I have build a musicbox with an rpi 3+ and added a power button and 2 buttons to turn the volume up and down. The buttons have LED lighting, I have connected them to GPIO pins but this results in ...
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2answers
800 views

Car Powered Raspberry Pi: Safe Shutdown and Power On

Apologies if this is a duplicate, but I can't seem to find a suitable solution. I need to power a Raspberry Pi in a car, and for obvious reasons need to shutdown gracefully, however, I need it to ...
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0answers
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All files lost during long shelf time

i was using my raspberry pi 3 over ssh and doing a bunch of scripts, cron jobs, etc. then i stopped for a bit and shifted my focus elsewhere and my pi remained unplugged on my desk for a few months. ...
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1answer
35 views

Raspberry Pi 2 power consumption incorrectly

Before, i'd a problem about changing governor for my Pi (cpu always stays at 600Mhz in every mode), after doing some tweaking, i'd already make it up to 900Mhz. However, now i'm using a power-meter to ...
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2answers
85 views

How to know if Raspberry is running

I'd like to implement an electronic circuit to be able to restart my raspberry Pi when it has been shutdown (without plugging in and out the USB charger, which will obviously remain plugged all the ...
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0answers
62 views

“Performance” gorvernor doesn't change cpu frequency

When i tried to change the default governor of my Raspberry Pi 2 (currently at Powersave mode) to Performance mode which is expected to push my Pi's CPU freq up to its maximum number (900Mhz) by using ...
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1answer
39 views

Don't start Pi on power connection

I've currently got my raspberry pi setup with a power switch that wakes it up from power off (using GPIO3) and shuts it down safely using a simple python script. Pretty basic stuff. The problem ...
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1answer
34 views

Computing power and memory for regression analysis

Does raspberry pi 3 have enough computing power and memory to perform regression analysis?I am making a Coordinate measuring machine prototype for my final year project and I need to perform linear ...
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97 views

How best to power a motor hat asking for 6-12V for just two DC motors

I purchased a Waveshare Motor Hat because it has the nice Pi Zero size, extra long headers, and already has headers and blocks soldered, all for less than $13. https://www.waveshare.com/motor-driver-...
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0answers
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L293B unable to deliver power to dc motors on Raspberry Pi 3B+

I have a problem delivering power to 2 dc motors using L293B on Raspberry Pi3B+ I run the following code: GPIO.setmode(GPIO.BOARD) GPIO.setup(11, GPIO.OUT)#To L239 Pin2 GPIO.setup(12, GPIO.OUT) #To ...
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1answer
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GPIO solution to power Pi [closed]

Looking for a GPIO solution to power a Pi 3 B+. Basically, trying to bypass the Pi micro USB connector. Also, any suggestions on hardware to build a compact, inverted, USB male right-angle ribbon ...
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2answers
1k views

Raspberry Pi with USB 3 (or 3.1) and enough power to use 2 drives

I bought a new camera which writes a lot of data onto SSDs, which I then would like to transfer onto HDDs. I thought about using a Raspberry Pi, but I was told it doesn't have enough power for a ssd ...